Putrefax 
Creature — Phyrexian Horror
$0.34 #15787 1.06 16.1 years
Trample, haste
Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
At the beginning of the end step, sacrifice this creature.
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Cards similar to Putrefax expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
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$0.19↓#136270.37↓15.7 years
"Infect"
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$0.15↓#184390.27↓15.4 years
"Infect"
Blackcleave Goblin96%
$0.20↓#170510.32↓16.1 years
"Infect"
Lost Leonin96%
$0.26↓#12570↑0.29↓15.4 years
"Infect"
Phyrexian Digester96%
$0.18↓#145240.33↓15.7 years
"Infect"
Glistener Elf96%
$0.60↑#6884↑0.50↓15.4 years
"Infect"
Priests of Norn96%
$0.24↓#152800.39↓15.7 years
"Infect"
Plague Stinger96%
$0.41↑#4646↑0.61↓16.1 years
"Infect"
Shriek Raptor96%
$0.17↓#21277↓0.50↓15.4 years
"Infect"
Tine Shrike96%
$0.18↓#182510.76↓15.7 years
"Infect"
Flensermite95%
$0.27↓#12319↑0.19↓15.7 years
"Infect"
Groundbreaker94%
$1.39↑#163070.00↓19.7 years↑
"At the beginning of the end step, sacrifice this creature."
+1 more matching line
Arc Runner94%
$0.11↓#168660.07↓16.3 years
"At the beginning of the end step, sacrifice this creature."
Ball Lightning94%
$0.42↑#8677↑0.07↓32.2 years↑
"At the beginning of the end step, sacrifice this creature."
Core Prowler94%
$0.64↑#7768↑1.0615.7 years
"Infect"